Catholic Church. Pope (1939-1958 : Pius XII), National Catholic Welfare Conference, & Pius XII, P. (1951). Sempiternus rex: Encyclical letter of Pope Pius XII on the fifteenth centenary of the Council of Chalcedo. National Catholic Welfare Conference.
Style de citation Chicago (17e éd.)Catholic Church. Pope (1939-1958 : Pius XII), National Catholic Welfare Conference, et Pope Pius XII. Sempiternus Rex: Encyclical Letter of Pope Pius XII on the Fifteenth Centenary of the Council of Chalcedo. Washington, D.C.: National Catholic Welfare Conference, 1951.
Style de citation MLA (8e éd.)Catholic Church. Pope (1939-1958 : Pius XII), et al. Sempiternus Rex: Encyclical Letter of Pope Pius XII on the Fifteenth Centenary of the Council of Chalcedo. National Catholic Welfare Conference, 1951.